mirror of
https://github.com/systemd/systemd.git
synced 2024-12-20 07:33:41 +08:00
6d825ab2d4
Instead of embedding the commands to invoke directly in the macros, let's use a helper script as indirection. This has a couple of advantages: - the macro language is awkward, we need to suffix most commands by "|| :" and "\", which is easy to get wrong. In the new scheme, the macro becomes a single simple command. - in the script we can use normal syntax highlighting, shellcheck, etc. - it's also easier to test the invoked commands by invoking the helper manually. - most importantly, the logic is contained in the helper, i.e. we can update systemd rpm and everything uses the new helper. Before, we would have to rebuild all packages to update the macro definition. This raises the question whether it makes sense to use the lua scriptlets when the real work is done in a bash script. I think it's OK: we still have the efficient lua scripts that do the short scripts, and we use a single shared implementation in bash to do the more complex stuff. The meson version is raised to 0.47 because that's needed for install_mode. We were planning to raise the required version anyway…
360 lines
15 KiB
Plaintext
360 lines
15 KiB
Plaintext
systemd System and Service Manager
|
|
|
|
DETAILS:
|
|
http://0pointer.de/blog/projects/systemd.html
|
|
|
|
WEB SITE:
|
|
https://www.freedesktop.org/wiki/Software/systemd
|
|
|
|
GIT:
|
|
git@github.com:systemd/systemd.git
|
|
https://github.com/systemd/systemd
|
|
|
|
MAILING LIST:
|
|
https://lists.freedesktop.org/mailman/listinfo/systemd-devel
|
|
|
|
IRC:
|
|
#systemd on irc.libera.chat
|
|
|
|
BUG REPORTS:
|
|
https://github.com/systemd/systemd/issues
|
|
|
|
AUTHOR:
|
|
Lennart Poettering
|
|
Kay Sievers
|
|
...and many others
|
|
|
|
LICENSE:
|
|
LGPLv2.1+ for all code
|
|
- except src/basic/MurmurHash2.c which is Public Domain
|
|
- except src/basic/siphash24.c which is CC0 Public Domain
|
|
- except src/journal/lookup3.c which is Public Domain
|
|
- except src/udev/* which is (currently still) GPLv2, GPLv2+
|
|
- except tools/chromiumos/* which is BSD-style
|
|
|
|
REQUIREMENTS:
|
|
Linux kernel >= 3.13
|
|
Linux kernel >= 4.2 for unified cgroup hierarchy support
|
|
Linux kernel >= 4.10 for cgroup-bpf egress and ingress hooks
|
|
Linux kernel >= 4.15 for cgroup-bpf device hook
|
|
Linux kernel >= 4.17 for cgroup-bpf socket address hooks
|
|
Linux kernel >= 5.3 for bounded-loops in BPF program
|
|
Linux kernel >= 5.4 for signed Verity images support
|
|
|
|
Kernel Config Options:
|
|
CONFIG_DEVTMPFS
|
|
CONFIG_CGROUPS (it is OK to disable all controllers)
|
|
CONFIG_INOTIFY_USER
|
|
CONFIG_SIGNALFD
|
|
CONFIG_TIMERFD
|
|
CONFIG_EPOLL
|
|
CONFIG_UNIX (it requires CONFIG_NET, but every other flag in it is not necessary)
|
|
CONFIG_SYSFS
|
|
CONFIG_PROC_FS
|
|
CONFIG_FHANDLE (libudev, mount and bind mount handling)
|
|
|
|
Kernel crypto/hash API
|
|
CONFIG_CRYPTO_USER_API_HASH
|
|
CONFIG_CRYPTO_HMAC
|
|
CONFIG_CRYPTO_SHA256
|
|
|
|
udev will fail to work with the legacy sysfs layout:
|
|
CONFIG_SYSFS_DEPRECATED=n
|
|
|
|
Legacy hotplug slows down the system and confuses udev:
|
|
CONFIG_UEVENT_HELPER_PATH=""
|
|
|
|
Userspace firmware loading is not supported and should
|
|
be disabled in the kernel:
|
|
CONFIG_FW_LOADER_USER_HELPER=n
|
|
|
|
Some udev rules and virtualization detection relies on it:
|
|
CONFIG_DMIID
|
|
|
|
Support for some SCSI devices serial number retrieval, to
|
|
create additional symlinks in /dev/disk/ and /dev/tape:
|
|
CONFIG_BLK_DEV_BSG
|
|
|
|
Required for PrivateNetwork= in service units:
|
|
CONFIG_NET_NS
|
|
Note that systemd-localed.service and other systemd units use
|
|
PrivateNetwork so this is effectively required.
|
|
|
|
Required for PrivateUsers= in service units:
|
|
CONFIG_USER_NS
|
|
|
|
Optional but strongly recommended:
|
|
CONFIG_IPV6
|
|
CONFIG_AUTOFS_FS
|
|
CONFIG_TMPFS_XATTR
|
|
CONFIG_{TMPFS,EXT4_FS,XFS,BTRFS_FS,...}_POSIX_ACL
|
|
CONFIG_SECCOMP
|
|
CONFIG_SECCOMP_FILTER (required for seccomp support)
|
|
CONFIG_CHECKPOINT_RESTORE (for the kcmp() syscall)
|
|
|
|
Required for CPUShares= in resource control unit settings
|
|
CONFIG_CGROUP_SCHED
|
|
CONFIG_FAIR_GROUP_SCHED
|
|
|
|
Required for CPUQuota= in resource control unit settings
|
|
CONFIG_CFS_BANDWIDTH
|
|
|
|
Required for IPAddressDeny=, IPAddressAllow=, IPIngressFilterPath=,
|
|
IPEgressFilterPath= in resource control unit settings
|
|
unit settings
|
|
CONFIG_BPF
|
|
CONFIG_BPF_SYSCALL
|
|
CONFIG_BPF_JIT
|
|
CONFIG_HAVE_EBPF_JIT
|
|
CONFIG_CGROUP_BPF
|
|
|
|
Required for SocketBind{Allow|Deny}= in resource control unit settings
|
|
CONFIG_BPF
|
|
CONFIG_BPF_SYSCALL
|
|
CONFIG_BPF_JIT
|
|
CONFIG_HAVE_EBPF_JIT
|
|
CONFIG_CGROUP_BPF
|
|
|
|
For UEFI systems:
|
|
CONFIG_EFIVAR_FS
|
|
CONFIG_EFI_PARTITION
|
|
|
|
Required for signed Verity images support:
|
|
CONFIG_DM_VERITY_VERIFY_ROOTHASH_SIG
|
|
|
|
We recommend to turn off Real-Time group scheduling in the
|
|
kernel when using systemd. RT group scheduling effectively
|
|
makes RT scheduling unavailable for most userspace, since it
|
|
requires explicit assignment of RT budgets to each unit whose
|
|
processes making use of RT. As there's no sensible way to
|
|
assign these budgets automatically this cannot really be
|
|
fixed, and it's best to disable group scheduling hence.
|
|
CONFIG_RT_GROUP_SCHED=n
|
|
|
|
It's a good idea to disable the implicit creation of networking bonding
|
|
devices by the kernel networking bonding module, so that the
|
|
automatically created "bond0" interface doesn't conflict with any such
|
|
device created by systemd-networkd (or other tools). Ideally there
|
|
would be a kernel compile-time option for this, but there currently
|
|
isn't. The next best thing is to make this change through a modprobe.d
|
|
drop-in. This is shipped by default, see modprobe.d/systemd.conf.
|
|
|
|
Required for systemd-nspawn:
|
|
CONFIG_DEVPTS_MULTIPLE_INSTANCES or Linux kernel >= 4.7
|
|
|
|
Required for systemd-oomd:
|
|
CONFIG_PSI
|
|
|
|
Note that kernel auditing is broken when used with systemd's
|
|
container code. When using systemd in conjunction with
|
|
containers, please make sure to either turn off auditing at
|
|
runtime using the kernel command line option "audit=0", or
|
|
turn it off at kernel compile time using:
|
|
CONFIG_AUDIT=n
|
|
If systemd is compiled with libseccomp support on
|
|
architectures which do not use socketcall() and where seccomp
|
|
is supported (this effectively means x86-64 and ARM, but
|
|
excludes 32-bit x86!), then nspawn will now install a
|
|
work-around seccomp filter that makes containers boot even
|
|
with audit being enabled. This works correctly only on kernels
|
|
3.14 and newer though. TL;DR: turn audit off, still.
|
|
|
|
glibc >= 2.16
|
|
libcap
|
|
libmount >= 2.30 (from util-linux)
|
|
(util-linux *must* be built without --enable-libmount-support-mtab)
|
|
libseccomp >= 2.3.1 (optional)
|
|
libblkid >= 2.24 (from util-linux) (optional)
|
|
libkmod >= 15 (optional)
|
|
PAM >= 1.1.2 (optional)
|
|
libcryptsetup (optional), >= 2.3.0 required for signed Verity images support
|
|
libaudit (optional)
|
|
libacl (optional)
|
|
libbpf >= 0.2.0 (optional)
|
|
libfdisk >= 2.33 (from util-linux) (optional)
|
|
libselinux (optional)
|
|
liblzma (optional)
|
|
liblz4 >= 1.3.0 / 130 (optional)
|
|
libzstd >= 1.4.0 (optional)
|
|
libgcrypt (optional)
|
|
libqrencode (optional)
|
|
libmicrohttpd (optional)
|
|
libpython (optional)
|
|
libidn2 or libidn (optional)
|
|
gnutls >= 3.1.4 (optional, >= 3.6.0 is required to support DNS-over-TLS with gnutls)
|
|
openssl >= 1.1.0 (optional, required to support DNS-over-TLS with openssl)
|
|
elfutils >= 158 (optional)
|
|
polkit (optional)
|
|
tzdata >= 2014f (optional)
|
|
pkg-config
|
|
gperf
|
|
docbook-xsl (optional, required for documentation)
|
|
xsltproc (optional, required for documentation)
|
|
python-jinja2
|
|
python-lxml (optional, required to build the indices)
|
|
python >= 3.5
|
|
meson >= 0.47 (>= 0.49 is required to build position-independent executables)
|
|
ninja
|
|
gcc, awk, sed, grep, and similar tools
|
|
clang >= 10.0, llvm >= 10.0 (optional, required to build BPF programs
|
|
from source code in C)
|
|
|
|
During runtime, you need the following additional
|
|
dependencies:
|
|
|
|
util-linux >= v2.27.1 required
|
|
dbus >= 1.4.0 (strictly speaking optional, but recommended)
|
|
NOTE: If using dbus < 1.9.18, you should override the default
|
|
policy directory (--with-dbuspolicydir=/etc/dbus-1/system.d).
|
|
dracut (optional)
|
|
polkit (optional)
|
|
|
|
To build in directory build/:
|
|
meson setup build/ && meson compile -C build/
|
|
|
|
Any configuration options can be specified as -Darg=value... arguments
|
|
to meson. After the build directory is initially configured, meson will
|
|
refuse to run again, and options must be changed with:
|
|
meson configure -Darg=value build/
|
|
meson configure without any arguments will print out available options and
|
|
their current values.
|
|
|
|
Useful commands:
|
|
meson compile -v -C build/ some/target
|
|
meson test -C build/
|
|
sudo meson install -C build/
|
|
DESTDIR=... meson install -C build/
|
|
|
|
A tarball can be created with:
|
|
git archive --format=tar --prefix=systemd-222/ v222 | xz > systemd-222.tar.xz
|
|
|
|
When systemd-hostnamed is used, it is strongly recommended to
|
|
install nss-myhostname to ensure that, in a world of
|
|
dynamically changing hostnames, the hostname stays resolvable
|
|
under all circumstances. In fact, systemd-hostnamed will warn
|
|
if nss-myhostname is not installed.
|
|
|
|
nss-systemd must be enabled on systemd systems, as that's required for
|
|
DynamicUser= to work. Note that we ship services out-of-the-box that
|
|
make use of DynamicUser= now, hence enabling nss-systemd is not
|
|
optional.
|
|
|
|
Note that the build prefix for systemd must be /usr. (Moreover,
|
|
packages systemd relies on — such as D-Bus — really should use the same
|
|
prefix, otherwise you are on your own.) -Dsplit-usr=false (which is the
|
|
default and does not need to be specified) is the recommended setting.
|
|
-Dsplit-usr=true can be used to give a semblance of support for systems
|
|
with programs installed split between / and /usr. Moving everything
|
|
under /usr is strongly encouraged.
|
|
|
|
Additional packages are necessary to run some tests:
|
|
- busybox (used by test/TEST-13-NSPAWN-SMOKE)
|
|
- nc (used by test/TEST-12-ISSUE-3171)
|
|
- python3-pyparsing
|
|
- python3-evdev (used by hwdb parsing tests)
|
|
- strace (used by test/test-functions)
|
|
- capsh (optional, used by test-execute)
|
|
|
|
USERS AND GROUPS:
|
|
Default udev rules use the following standard system group
|
|
names, which need to be resolvable by getgrnam() at any time,
|
|
even in the very early boot stages, where no other databases
|
|
and network are available:
|
|
|
|
audio, cdrom, dialout, disk, input, kmem, kvm, lp, render, tape, tty, video
|
|
|
|
During runtime, the journal daemon requires the
|
|
"systemd-journal" system group to exist. New journal files will
|
|
be readable by this group (but not writable), which may be used
|
|
to grant specific users read access. In addition, system
|
|
groups "wheel" and "adm" will be given read-only access to
|
|
journal files using systemd-tmpfiles.service.
|
|
|
|
The journal remote daemon requires the
|
|
"systemd-journal-remote" system user and group to
|
|
exist. During execution this network facing service will drop
|
|
privileges and assume this uid/gid for security reasons.
|
|
|
|
Similarly, the network management daemon requires the
|
|
"systemd-network" system user and group to exist.
|
|
|
|
Similarly, the name resolution daemon requires the
|
|
"systemd-resolve" system user and group to exist.
|
|
|
|
Similarly, the coredump support requires the
|
|
"systemd-coredump" system user and group to exist.
|
|
|
|
NSS:
|
|
systemd ships with four glibc NSS modules:
|
|
|
|
nss-myhostname resolves the local hostname to locally configured IP
|
|
addresses, as well as "localhost" to 127.0.0.1/::1.
|
|
|
|
nss-resolve enables DNS resolution via the systemd-resolved DNS/LLMNR
|
|
caching stub resolver "systemd-resolved".
|
|
|
|
nss-mymachines enables resolution of all local containers registered
|
|
with machined to their respective IP addresses.
|
|
|
|
nss-systemd enables resolution of users/group registered via the
|
|
User/Group Record Lookup API (https://systemd.io/USER_GROUP_API),
|
|
including all dynamically allocated service users. (See the
|
|
DynamicUser= setting in unit files.)
|
|
|
|
To make use of these NSS modules, please add them to the "hosts:",
|
|
"passwd:" and "group:" lines in /etc/nsswitch.conf. The "resolve"
|
|
module should replace the glibc "dns" module in this file (and don't
|
|
worry, it chain-loads the "dns" module if it can't talk to resolved).
|
|
|
|
The four modules should be used in the following order:
|
|
|
|
passwd: compat systemd
|
|
group: compat systemd
|
|
hosts: files mymachines resolve [!UNAVAIL=return] dns myhostname
|
|
|
|
SYSV INIT.D SCRIPTS:
|
|
When calling "systemctl enable/disable/is-enabled" on a unit which is a
|
|
SysV init.d script, it calls /usr/lib/systemd/systemd-sysv-install;
|
|
this needs to translate the action into the distribution specific
|
|
mechanism such as chkconfig or update-rc.d. Packagers need to provide
|
|
this script if you need this functionality (you don't if you disabled
|
|
SysV init support).
|
|
|
|
Please see src/systemctl/systemd-sysv-install.SKELETON for how this
|
|
needs to look like, and provide an implementation at the marked places.
|
|
|
|
WARNINGS:
|
|
systemd will warn during early boot if /usr is not already mounted at
|
|
this point (that means: either located on the same file system as / or
|
|
already mounted in the initrd). While in systemd itself very little
|
|
will break if /usr is on a separate, late-mounted partition, many of
|
|
its dependencies very likely will break sooner or later in one form or
|
|
another. For example, udev rules tend to refer to binaries in /usr,
|
|
binaries that link to libraries in /usr or binaries that refer to data
|
|
files in /usr. Since these breakages are not always directly visible,
|
|
systemd will warn about this, since this kind of file system setup is
|
|
not really supported anymore by the basic set of Linux OS components.
|
|
|
|
systemd requires that the /run mount point exists. systemd also
|
|
requires that /var/run is a symlink to /run.
|
|
|
|
For more information on this issue consult
|
|
https://www.freedesktop.org/wiki/Software/systemd/separate-usr-is-broken
|
|
|
|
To run systemd under valgrind, compile with meson option
|
|
-Dvalgrind=true and have valgrind development headers installed
|
|
(i.e. valgrind-devel or equivalent). Otherwise, false positives will be
|
|
triggered by code which violates some rules but is actually safe. Note
|
|
that valgrind generates nice output only on exit(), hence on shutdown
|
|
we don't execve() systemd-shutdown.
|
|
|
|
STABLE BRANCHES AND BACKPORTS:
|
|
Stable branches with backported patches are available in the
|
|
systemd-stable repo at https://github.com/systemd/systemd-stable.
|
|
|
|
Stable branches are started for certain releases of systemd and named
|
|
after them, e.g. v238-stable. Stable branches are managed by
|
|
distribution maintainers on an as needed basis. See
|
|
https://www.freedesktop.org/wiki/Software/systemd/Backports/ for some
|
|
more information and examples.
|